How do recruiters find Executive candidates online?

Next week I am giving a presentation on career development to a group of executives. The main focus is on social media and specifically on LinkedIn as a channel to creating a personal brand and for being found by recruiters. To help in my preparation, would you mind sharing some of your experiences in recruiting executives? Where do you look for candidates? What are your favorite places to look for candidates? Is LinkedIn at the top? How much do you focus on already submitted applications versus finding prospects online? How do you find and filter the most interesting resumes? Do you use...